CN102094414A - Method for treating deep soft soil foundation by combining chemical electro-osmosis method and vacuum preloading method - Google Patents
Method for treating deep soft soil foundation by combining chemical electro-osmosis method and vacuum preloading method Download PDFInfo
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- CN102094414A CN102094414A CN 201110083357 CN201110083357A CN102094414A CN 102094414 A CN102094414 A CN 102094414A CN 201110083357 CN201110083357 CN 201110083357 CN 201110083357 A CN201110083357 A CN 201110083357A CN 102094414 A CN102094414 A CN 102094414A
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Abstract
The invention discloses a method for treating a deep soft soil foundation by combining a chemical electro-osmosis method and a vacuum preloading method. In the method, vertical porous drain pipes and metal electrodes are inserted and chemical solution is injected into the soft soil foundation, horizontal drain boards and seal geomembranes are laid on the top of a soil layer, direct current is supplied, vacuumization is carried out, and under the action of direct-current electric field force, water with positive charge and cation solution flow to a cathode and anion solution with negative charge flows to an anode to form electro-osmosis and chemical reaction; meanwhile, under the action of internal and external pressure difference formed through vacuumization, water is quickly discharged from the drain pipe in which the cathode is positioned; and the solidification and compactness of the foundation soil are accelerated and the soil strength of the soil is improved. Compared with the common vacuum preloading method, the method has the advantages that: the soft soil treatment depth is increased, the deep layer of the soil of which the vacuum degree is difficult to reduced can be reached, and under the action of the direct-current electric field force, the solidification rate of the soil is improved and the construction period is shortened. Through the method, the construction process is simple, the operability is high, the construction period is short, the quality control and detection are facilitated, and the soil strength is improved obviously.
Description
Technical field
The present invention relates to a kind of deep soft soil foundation processing technology field, relate in particular to a kind of chemical electroosmotic drainage combined vacuum preloading method and handle the deep soft soil foundation method.Mainly be adapted to field of engineering technology such as deep soft soil foundation processing such as strand or riverine beach, depression etc.
Background technology
Before the present invention, Chinese patent " a kind of reinforcement means of soft foundation " (ZL 200810018498.9) discloses a kind of being applicable to based on the minimum stream mud of ultra-fine grain and the coefficient of consolidation, the reinforcing soft foundation combined method of mucky soil ground: at first utilize the self-load combined precompressed of low-position vacuum that the place weak soil is once reinforced; Secondly the vacuum preloading electroosmotic drainage is to place weak soil second consolidation; Utilize vacuum electroosmosis precipitation that the mudding layer is reinforced then; Last vibroroller cmpacting leveling place.Though this method combined treatment is satisfactory for result, complex process, and the duration is longer, and several processing methods are all carried out at same soil layer, and it is limited to handle the degree of depth.Chinese patent " the pre-reinforcing and processing method and the device thereof of mixed hydraulically-filled soft soil foundation " (ZL 200910061919.0) discloses a kind of pre-reinforcing and processing method and device thereof of mixed hydraulically-filled soft soil foundation, level is set to drainage channel in mixed hydraulically-filled process, and in conjunction with adopting the construction of vacuum pre-pressed joint electroosmotic drainage, in the hydraulic reclamation process and the hydraulic reclamation initial stage promptly to ultra-soft fixed the intervention and preliminary treatment of soil.This method mainly is applied as preliminary treatment, and vacuum preloading and electroosmotic drainage construction are all at same soil layer, and it is more shallow relatively to handle the degree of depth.Vacuum method is owing to be subjected to factor affecting such as soil layer property, vacuum pump power, and vacuum reduces gradually along with the increase of the soil body degree of depth, thereby it is limited to cause handling the degree of depth, generally about 10 meters.Conventional electroosmotic drainage need not constructional materialss such as cement, sandstone, to environment no dust pollution, noiselessness, and need not heavy construction machinery in the construction; But the processing cycle is longer relatively.And along with the expansion of infrastructure construction scale, especially coastal, riverine and in ground lakeland when carrying out construction such as harbour, municipal administration, highway and railway, (weak soil thickness reaches about 20 meters often to need to handle deep soft soil foundation, even it is darker), therefore, above-mentioned patented method can only be to shallow layer foundation generation effect, and can't good treatment deep layer weak soil, thereby has limited its large-scale promotion application.
Summary of the invention
Handle when the objective of the invention is at existing vacuum method soft soil foundation the degree of depth limited, can't reach deep soft soil, when vacuumizing draining when acquiring a certain degree, it is bigger to continue the power consumption that draining need increase; It is relatively long and handle back intensity and improve problems such as limited that common electroosmotic drainage is handled the cycle, proposes a kind of chemical electroosmotic drainage combined vacuum preloading method and handle the deep soft soil foundation method.The chemistry electroosmotic drainage can be quickened the transfer of water in weak soil, and especially vacuum can't reach higher position in the deep layer weak soil; Vacuumize the velocity of discharge that can quicken water, both respectively have characteristics, mutually promote, and quicken weak native consolidated compacting.The present invention not only can handle deep soft soil, and by injecting chemical solution, chemical electroosmotic drainage can significantly improve infiltration rate, reduction of erection time, improves and handles the back soil strength.
Technical scheme of the present invention is:
In soft soil foundation, insert vertical porous drain and metal electrode and inject chemical solution, lay transverse drainage plate and sealing geomembrane successively at the soil layer top, pass to direct current then and vacuumize, under the effect of DC electric field power, positively charged water and cationic solution are to cathode flow, electronegative anion solutions anode flows, and forms electric osmose and chemical reaction; Under the effect of the external and internal pressure difference that vacuumizes formation, water is discharged from the gutter of negative electrode place fast simultaneously; Quicken the fixed densification of foundation soil, improve soil strength.
Metal electrode of the present invention is a reinforcing bar, its diameter is about 12 mm, it is fixed that length is come according to the processing soft soil degree of depth, maximum can reach about 25 m, 2,3 roads insulation stirrup evenly distributes in the middle of the reinforcing bar, reinforcing bar top and transverse drainage plate and bottom and porous drain contact site scribble coatings, guarantee the reinforcing bar perpendicular positioning and directly do not contact with porous drain.For convenience of the stube cable line, electrode generally bassets about 0.5 m.Porous drain of the present invention be diameter about 50 mm, four sides symmetry on the pipe, evenly distribute spacing 50 mm, the aperture of aperture between 5-10 mm, the gutter lower end connects the taper shoe.
The chemical solution of the acceleration electric osmose speed that the present invention adopts is calcium chloride solution (CaCl
2) and sodium silicate solution (Na
2SiO
3), add in the gutter at positive and negative electrode place respectively after, its on-the-spot initial calcium chloride solution concentration is reached about 10 %, the content of silicate of soda is about 2 times of calcium chloride content in the solution.Under the effect of DC electric field power, shown in the following formula of the chemical reaction of generation.
The job practices of technical solution of the present invention, its major technique step is:
(1) levelling of the land, and set up fence and warning sign at the process range periphery, according to design conditions, make metal electrode and arrange insulation stirrup and coatings at design attitude;
(2) measure unwrapping wire, will be with the porous vertical drainage pipe static pressure of taper shoe to sink to design attitude;
(3) in the vertical drainage pipe, sink to metal electrode successively, and one typical case adjacent two vertical drainage pipes near and respective depth bury thermometer underground;
(4) face south respectively, inject calcium chloride solution and sodium silicate solution in the porous drain at negative electrode reinforcing bar place by the top, make that on-the-spot solution concentration reaches respectively about 10 % and 20 % in the pipe at positive and negative electrode steel bar place;
(5) lay transverse drainage plate and top seal film, and connect vacuum pump;
(6) utilize cable to connect each positive and negative electrode, and be connected with dc power supply respectively, ammeter of middle series connection;
(7) open vacuum pump and dc source, begin the associating construction;
(8) when displacement obviously less before (initial flow about 1/5), counter-rotating yin, yang electrode, and continue energising infiltration combined vacuum precompressed construction;
(9) along with the continuing of conduction time, when displacement goes to zero, temperature reading reaches 100 near the anode
oDuring the C left and right sides, stop electric osmose combined vacuum precompressed construction, finish the treatment of soft foundation process; Perhaps also can determine time of stopping to construct according to the bearing capacity of foundation soil processing requirements.
Advantage of the present invention is with effect: compare with the conventional vacuum preloading, the present invention has improved the processing soft soil degree of depth, can reach the difficult soil body deep layer that reduces of vacuum, under the effect of DC electric field power, quickens soil solidifying speed, shortens the construction period; Compare with conventional electroosmotic drainage, the present invention has strengthened the electrical conductivity of the soil body, has improved infiltration rate, thereby has shortened electric osmose processing time and construction period, and the change increased response by two kinds of solution soil strength.And calcium chloride solution, sodium silicate solution and the salt and the sediment that take place to generate behind the chemical reaction do not pollute environment, and the prices of raw and semifnished materials are cheap.This method construction technology is simple, workable, and the construction period is short, is convenient to quality control, detection, and it is remarkable to improve soil strength.
Description of drawings
Fig. 1 is structure of the present invention and arranges schematic diagram.
Fig. 2 is a vertical porous drain cross sectional representation of the present invention.
Fig. 3 is an insulation stirrup schematic diagram of the present invention.
Among the figure: 1 is gutter, and 2 are the taper shoe, and 3 is aperture on the gutter, and 4 is reinforcing bar, and 5 are the insulation stirrup, 6 is coatings, and 7 is thermometer, and 8 are the transverse drainage plate, and 9 are the sealing geomembrane, 10 is vacuum pump, and 11 is cable, and 12 is ammeter, and 13 is dc source.
The specific embodiment
Be described in detail the specific embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.Protection scope of the present invention is not limited only to the description of present embodiment.
As shown in Figure 1, be uniform-distribution with aperture 3 on the vertical drainage pipe 1, the lower end connects taper shoe 2, and the upper end is communicated with transverse drainage plate 8; Distribution insulation stirrup 5 on the electrode steel bar 4, reinforcing bar 4 tops and transverse drainage plate 8 and bottom and porous drain 1 contact site scribble coatings 6, and electrode steel bar 4 is connected by cable 11 with ammeter 12 with dc source 13.
During enforcement, first smooth place, and set up fence and warning sign at the process range periphery, and according to design conditions, make metal electrode, reinforcing bar 4 is arranged insulation stirrup 5 and coatings 6 at design attitude; Measure unwrapping wire, will be with porous vertical drainage pipe 1 static pressure of taper shoe 2 to sink to design attitude; In vertical drainage pipe 1, sink to metal electrode successively; Face south respectively, inject calcium chloride solution and sodium silicate solution in the vertical drainage pipe at negative electrode reinforcing bar 4 places 1 by the top, make that on-the-spot solution concentration reaches respectively about 10 % and 20 % in the pipe at positive and negative electrode steel bar 4 places; Lay transverse drainage plate 8 and top seal geomembrane 9, and connect vacuum pump 10; Utilize cable 11 to connect each positive and negative electrode, and be connected with dc power supply 13 respectively, ammeter 12 of middle series connection; Open vacuum pump 10 and dc source 13, begin the associating construction; When displacement obviously reduces (initial flow about 1/5) before, counter-rotating yin, yang electrode, and continue energising infiltration combined vacuum precompressed construction; Along with continuing of conduction time, when displacement goes to zero, thermometer 7 readings reach 100 near the anode
oDuring the C left and right sides, stop electric osmose combined vacuum precompressed construction, finish the treatment of soft foundation process; Perhaps also can determine time of stopping to construct according to the bearing capacity of foundation soil processing requirements.
Claims (2)
1. a chemical electroosmotic drainage combined vacuum preloading method is handled the deep soft soil foundation method, it is characterized in that: in soft soil foundation, insert vertical porous drain and metal electrode and inject chemical solution, lay transverse drainage plate and sealing geomembrane successively at the soil layer top, pass to direct current then and vacuumize water and chemical solution formation electric osmose and chemical reaction in the soil body; It is poor to utilize simultaneously at the external and internal pressure that vacuumizes formation, and water is discharged from the gutter of negative electrode place fast; Quicken the fixed densification of foundation soil, improve soil strength.
2. a kind of chemical electroosmotic drainage combined vacuum preloading method according to claim 1 is handled the deep soft soil foundation method, it is characterized in that: described metal electrode is the reinforcing bar of diameter at 8-15mm, even 2, the 3 roads insulation stirrup that distributes in the middle of the reinforcing bar, reinforcing bar top and transverse drainage plate and bottom and porous drain contact site scribble coatings.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102409663A (en) * | 2011-11-02 | 2012-04-11 | 河海大学 | Method for processing soft foundation by combining electrochemical grouting with slurry-cemented discrete material pile |
| CN102535432A (en) * | 2011-12-26 | 2012-07-04 | 河海大学 | Vacuumizing-electroosmosis-stacking combined soft-foundation consolidating system and method |
| CN103061230A (en) * | 2013-01-18 | 2013-04-24 | 湖南城市学院 | Construction method of technology utilizing ground source heat pump to cool and melt frozen road surfaces and drain boards for construction |
| CN104005401A (en) * | 2014-06-12 | 2014-08-27 | 天津大学 | Vacuum preloading solidification drainage channel |
| CN104452738A (en) * | 2014-11-26 | 2015-03-25 | 禹顺生态建设有限公司 | Construction method for existing dyke soft foundation electrochemical treatment |
| CN104805823A (en) * | 2015-01-05 | 2015-07-29 | 温州大学 | Large-scale model test device for supercharged vacuum prepressing and electro-osmosis combined treatment for soft soil foundation |
| WO2015192750A1 (en) * | 2014-06-16 | 2015-12-23 | 武汉河海泽地电渗科技有限公司 | Plastic electrode tube for electroosmotic drainage method |
| CN106284293A (en) * | 2016-08-08 | 2017-01-04 | 中交上航局航道建设有限公司 | A kind of system and method for vacuum pre-pressed joint electric osmose reinforcing soft ground |
| CN106284292A (en) * | 2015-06-09 | 2017-01-04 | 江苏德盈土工材料有限公司 | A kind of consolidating mud soil electrochemical modification hardened system |
| CN108411891A (en) * | 2018-03-15 | 2018-08-17 | 温州大学 | The method of the pre- cured barged-in fill of biological bacteria combined vacuum |
| CN113897943A (en) * | 2021-11-15 | 2022-01-07 | 江苏科技大学 | Device and method for treating soft soil foundation through electroosmosis combined grouting |
| CN114878784A (en) * | 2022-05-18 | 2022-08-09 | 江苏科技大学 | Soft soil solidification test device and method |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102409663A (en) * | 2011-11-02 | 2012-04-11 | 河海大学 | Method for processing soft foundation by combining electrochemical grouting with slurry-cemented discrete material pile |
| CN102409663B (en) * | 2011-11-02 | 2013-09-25 | 河海大学 | Method for processing soft foundation by combining electrochemical grouting with slurry-cemented discrete material pile |
| CN102535432A (en) * | 2011-12-26 | 2012-07-04 | 河海大学 | Vacuumizing-electroosmosis-stacking combined soft-foundation consolidating system and method |
| CN102535432B (en) * | 2011-12-26 | 2014-04-09 | 河海大学 | Vacuumizing-electroosmosis-stacking combined soft-foundation consolidating system and method |
| CN103061230A (en) * | 2013-01-18 | 2013-04-24 | 湖南城市学院 | Construction method of technology utilizing ground source heat pump to cool and melt frozen road surfaces and drain boards for construction |
| CN104005401A (en) * | 2014-06-12 | 2014-08-27 | 天津大学 | Vacuum preloading solidification drainage channel |
| WO2015192750A1 (en) * | 2014-06-16 | 2015-12-23 | 武汉河海泽地电渗科技有限公司 | Plastic electrode tube for electroosmotic drainage method |
| CN104452738A (en) * | 2014-11-26 | 2015-03-25 | 禹顺生态建设有限公司 | Construction method for existing dyke soft foundation electrochemical treatment |
| CN104805823A (en) * | 2015-01-05 | 2015-07-29 | 温州大学 | Large-scale model test device for supercharged vacuum prepressing and electro-osmosis combined treatment for soft soil foundation |
| CN104805823B (en) * | 2015-01-05 | 2017-03-22 | 温州大学 | Large-scale model test device for supercharged vacuum prepressing and electro-osmosis combined treatment for soft soil foundation |
| CN106284292A (en) * | 2015-06-09 | 2017-01-04 | 江苏德盈土工材料有限公司 | A kind of consolidating mud soil electrochemical modification hardened system |
| CN106284293A (en) * | 2016-08-08 | 2017-01-04 | 中交上航局航道建设有限公司 | A kind of system and method for vacuum pre-pressed joint electric osmose reinforcing soft ground |
| CN108411891A (en) * | 2018-03-15 | 2018-08-17 | 温州大学 | The method of the pre- cured barged-in fill of biological bacteria combined vacuum |
| CN113897943A (en) * | 2021-11-15 | 2022-01-07 | 江苏科技大学 | Device and method for treating soft soil foundation through electroosmosis combined grouting |
| CN113897943B (en) * | 2021-11-15 | 2022-07-19 | 江苏科技大学 | Device and method for treating soft soil foundation through electroosmosis combined grouting |
| CN114878784A (en) * | 2022-05-18 | 2022-08-09 | 江苏科技大学 | Soft soil solidification test device and method |
| CN114878784B (en) * | 2022-05-18 | 2023-09-22 | 江苏科技大学 | Soft soil solidification test device and method |
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Application publication date: 20110615 |